The pittifully small amount (16 tablets) that one is able to buy at a time imply that adults are incapable of controlling their use. If one has a conditon e.g back pain, that is known, does not need a visit to the doctor for a prescription and is likely to last for several days, it is impossible to buy more that 2 days supply in one transaction. Acquiring the number of tablets to treat the condition for the days when one is affected means visits to several suppliers or a totally unnecessary visit to a doctor to get a prescripion.
I would like to see restrictions on the purchase of everyday painkillere like paracetamol or ibuprofen etc. removed.